Sewing machine attachment for sewing on buttons



Sept. 22, 1931,

F. OTTO I 1,824,564

SEWING CHINE ATTACHIENT FOR SEWING'ON BUTTONS Filed July 21'. 192a:

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anwnre Inertial-Armenian I03 emu or mirrors Application fled July 81, 1886, lcr lal l'o. 284,505, and in Germany December 81, II".

Apparatus for sewing machines for sewing on buttons in which a displacement in the direction of the sewing is obtained mathin small limits, is already known. The distance between the cloth presser bar and the needle bar varies within certain comparative- 1 large limits in the various types of machines. This distance is for example in reciprocating shuttle machines 21.8 m/m. But not onl bars vary, it also happens, however, that the one bar is situated up against the other.

This invention relates to apparatus for sewing on buttons and can be usedin con- 'unction with any kind of sewing machine.

or this purpose it is provided with displacing mechanism in whichthe connecton between the frame of the a paratus for sewing on the buttons and a c amp for screwing on to the needle bar, can be adjusted in the sewing direction of the machine and transversely thereto. If an apparatus can be fitted to all sewing machines, only one kind of device for sewing on buttons .need be brought out, the parts of which can be made by mass production and consequently sold at a lower price.

An example of the invention is illustrated in the accompanying drawings, in which:

so Fig.1 is a side elevation,

Fig. 2 is :1 Ian view, and

F ig. 3 is a ront elevation.

Fig. 4 shows the manner of operation of the stroke regulating device for the frame, whereas Figs. 5 to 7 illustrate a modification of the holding device.

To the cloth presser bar 1 a.clamp 2 is fitted which is connected with the frame 3 carrying the actuating mechanism for the oscillating frame; The clamp 2 is mounted directly on the carrier 4 which is provided with a slot through which the attaching screw 5 passes. Said screw engages a further carrying plate 6 terminating in a screw 7 which is capable of adjustment through the adjusting nut. 7 a, after having loosened the screw 5. The plate 6 is secured to the.

frame 3 by means of a slide ide 37 which is held by a screw 8.; Furt r, a lever 9 does the distance between the.

is pivotally mounted on the plate 6 (see Fig. 3) the front end of said lever being provided withv a bolt'lO and a slot 11. By means of this slot 11 the lever engages the screw 12 on the needle bar, which screw serves for securing the needle. The bolt 10 transmits the movement imparted to it by the needle bar, to the bolt 13 on the lever 14. Said lever is fitted with a awl 16a in engagement with the ratchet w eel 16 and pressed against the teeth thereof by means of a spring 15. This spring also serves for depressing the lever 14 and is attached at one extremity to the lever and at the other extremity to the frame 3 by a crew 15a.

Throu h the upward and downward motion of t e needle bar, an oscillating movement is imparted tothe lever. 14 and on each upwardmovement the ratchet wheel 16 advances one tooth. The ratchet wheel is connected with a cam disc 17 (see Fig. 2) in which the pin 19 runs. This pin 19 is secured to a lever 18 connected to the frame 23 by means of a block or bolt 21. Said block 21 projects through the lever 18 and is slidably mounted thereon. It can be slid into any position on the lever 18 or the frame 23 by means of the screw 22. Under the needle bar is an aperture 25 in the frame 23 which latter is provided on the edge with downwardly projecting teeth 24.

Over this aperture the button holder 26 is arranged and consists of two arms pivotally mounted towards their centre point and carrying between their outer bent up portions 27 a, compression spring 28. The holder 26 is opened by means of an elbow lever one arm 29 of which carries on its extremity two pins engaged under the bent up portions 27. The other arm of the elbow lever forms .a handle 31 and is loaded by a spring 30 tending to force it to the r' ht.

The spring 28 is stronger than the s ring 30 so that the portions 27 are normally orced apart and the button holder maintained in gripping position. The holder is opened by moving the lever 31 to the right when the pins on the lever 29 force the two bent up portions 27 towards each other against the action of the spring 28 -and thereby move may rumluu apart the gripping ends of the holder 26. An adjusta le stop prevents the holder being opened more than is necessary for taking a certain size of button.

I The mounting ofthe apparatus is effected by a clamp on the presser'bar 1. After loosening the screw 5, the frame 23 is accurately adjusted to the distance from the cloth presser bar to the needle bar by turning the nut 7 a. The carrier late 6 is then regulated in the slide guide 3 on the frame 3 in such a manner that the lever 9 rests against the needle bar or needle block and is capable of free movement over the screw 12 serving to secure the needle.

When the machine is set in motion, the lever 9 and thereby the lever 14 will be moved up and down. By each upward movement of this latter the cam disc 17 is moved forward. Through the cam race and the transmission of the pin 19 and lever 18, the frame 23 will be subjected to an intermittent oscillating motion. If the button holder 26 is now opened by moving the lever 29 to the right, and a button inserted, the needle, owing to the backward and forward movement, enters alternately the two holes in the button in the oscillating direction and thus secures the button to the cloth situated thereunder. As said cloth is pressed onto its supporting surface by means of the teeth 24, a possible slipping of the cloth cannot cause a puckering in the opening 25, thus ensuring that the button will be neatly sewed on. \Vhen the sewing operation has been completed, the thread is cut and the button holder opened by means of the lever 29.

Seeing that the distance between the holes varies in the different buttons, the stroke of the frame 23 is adjustable. This is attained by the block 21 which is displaceable in the lever 18. The lever 18 is capable of swivelling on the screw 34, whilst the frame 23 swivels on its pivot 35 (see Figs. 1 and 4). According to the position ofthe block or bolt 21 connecting the lever 18 with the frame 23, the throw of the frame 23 is regulated, whereas the throw of the lever 18 remains unchanged. The position A of the block 21 corresponds with the throw a and the position B with the throw 6, as shown in Fig. 4. The front end of the lever 18 is forked and engages a screw pin 20 so that it is always accurately guided at its front end.

The adjustments are effected as follows: The clamp 2 is slotted enabling the whole apparatus to be slid over the pressure sliding bar from the rear to the'front and secured in position.

This clamp has a bridge-shaped extension 4 at the rear end. A screw threaded hole is provided in this extension, for the purpose of adjusting the carrier plate 6, which has a slot guide, in the sewing direction of the machine, whereby the difference in the distance The carrier plate is bent at right angles and its other end which is also sloltcd engages slidably in the counter guide 37 on the frame and thereby regulates the difl'erences between displacement of the needle and the pressure slide bar.

In order to limit the downward stroke of the lever 14, the frame 3 is adjusiable and a semi-elastic stop 38 provided. Same comrises a wire hook introduced into an eye 40 1n the frame and ressed against the side thereof by means 0 a screw 39.

Figs. 5 to 7 show a modification of the means of attachment. In this construction a carrier 54 carrying a clamp 52 is also attached directly to a carrier plate 56 by means of a clamping screw 55. On the other hand a lever 59 which, imparts the upward and downward motion to the lever 64, is not connected with the suitably bent carrier plate, as in the construction above described, but is rigidly secured to the needle bar. In this case it is not necessary for the lever 59 to be forked, as was hitherto necessary, in order to engage the clampin screw 12 of the needle on the needle bar or the purpose of imparting the upward and downward movement of this bar to the lever 59. In this construction the form of the carrier plate 56 is also m'oresimple. By displacement in the slot 550 an adjustment to suit the various 100 positions of the cloth presser bar can be obtained.

If the machine to which the new device is to be fitted is provided with a sinking or easily detachable feed slide, same can be 105 lowered or unscrewed, or the tooth plate can be removed.

I claim: 4

An apparatus for sewing on buttons whichv is detachabl mounted on the cloth presser 110 bar of existing sewing machines and actuated by the needle bar, comprising in combination with the cloth resser bar, a clamp screwed on said'presser ar, a frame, a guide on said frame, and a common bent carrier 11:; slidably mounted at one end in said guide and slidably connected at the other end to said carrying clamp in such a manner that I the apparatus is adjustable in the transverse and longitudinal directions of the'machine to allow for differences in the distances between the presser-and needle-bars in different makes of machines and to enable the sewlng-on of both two-and four-hole buttons.

In testimony whereof I afiix my signature.

' v FRANZ OTTO. 

